Pump



June 30, 1936. E. w. AUSTIN PUMP Filed Deo. 3l, 1934 APatented June 30, 1 936 UNITED STATES PATENT GFFICE PUMP Application December 31, 1934, Serial No. 759,944

4 Claims.

This invention relates in, general to pumps and has particular relation to the mounting and arrangement of the parts of such pumps in relation to the parts of a tractor or like prime mover.

While hydraulic pumps are commonly used with tractors and like prime movers, it is the usual practice to mount these pumps at the rear of the tractor and to drive them by extensions of the shafting of the tractor. This rear-end mounting of the pump has several disadvantages.

The pumps are in the way in mounting other equipment on the tractor and necessitate the use of various relatively expensive coupling members for driving them and for conveying liquid to and from the pump.

A much more advantageous location of the pump would be at the front of the tractor, where the pump may be driven directly from the tractor motor, without interruption of clutch disengagement as is the case with the conventional rear mounting.

There are also several disadvantages present .n the pumps known to the art. Thevpump frequently cannot be made leak-proof, and frequently end-thrust is encountered in the drive shaft by reason of the hydraulic pressure of the iiuid being pumped and no means is provided for taking up this thrust or allowing for endwise movement of the drive shaft.

It is, therefore, a general object of my invention to overcome the difilculties above enumerated and to provide a pump which may be mounted at the front of the tractor.

A more specific object of my invention is to provide means for mounting a pump on the radiator of a tractor.

Another object of my invention is to provide means whereby a crank may be employed for cranking the motor without the necessity of disconnecting or otherwise disturbing the pump.

Another object of my invention is to provide in a pump crank case means for inclosing the pump and pump drive.

Another object of my invention is to provide a seal means for a pump which will permit a controlled seepage from the pump housing into the gear case housing4 in order that the drive gears may be lubricated.

50 A Another object of my invention is to provide means whereby end-thrust on the drive shaft of the pump will not injure the pump.

Another object of my invention is to provide a metallic seal for pumps that does not require manual adjustment to meet varying conditions of fluid pressure.

Another object of my invention is to provide means for offsetting the pump whereby endthrust on the pump shaft does not injure the pump parts.

Other and further features and objects of my invention will be more apparent to those skilled in the art upon a consideration of the accompanying drawing and following specification, wherein is disclosed an exemplary embodiment of the invention, with the understanding, however, that such changes may be made therein as fall within the scope of the appended claims :Ivithout departing from the spirit of the invenion.

In said drawing:

Figure 1 is a view in section, taken along the line I-I of Figure 2, of a pump and pump mounting constructed according to one embod iment of my invention.

Figure 2v is a view, partly in front elevation and partly in section, of the pump andpump mounting shown in Figure 1; and

Figure 3 is a partial view of the seal means used for sealing the pump shaft with the pump housing.

Referring now to the drawing, there is shown at I 0 in outline the radiator of a tractor. An opening II is provided through the radiator in which an extension I2 of the crank shaft of the engine or other prime mover of the tractor may extend. A roughly cup-shaped gear housing or case I3 is securedv to a Isuitable ange I4 of the radiator III in any conventional manner as by means of bolts or the like. A gear case cover I6 is bolted to the open face of the gear case I3, as by means of bolts II, and a cylindrical, forwardly-extending flange I8 of the gear case I6 affords one bearing in which the stationary race I9 of a ball bearing may be located. A circular ange 2I on the rear face of the gear housing I3 affords a mounting means for the stationary race 22 of another ball bearing. A sleeve-like member 23 is threaded into the open end of the cylindrical portion I8 of the gear case cover I6 and this sleeve 23 retains the ball bearing 42 and serves also as a guide for the crank (not shown) used in cranking the motor. 'The sleeve 23 is held in place by means of a collar 24. The open end of the sleeve 23 may be covered by a cap 26 which is pivotally movable and pvotally engaged by means of a pin 21 and spring 28. The gear case I3 has an upwardly-extending portion indicated at I3a and the gear case cover I6 likewise has an upwardly-extending portion lia to serve as a housing for the. pump drive gearing hereinafter more particularly described.

The upper portion I6a of the gear case cover I6 is open at the front thereof and a pump housing 3| is secured to the gear case cover over the open portion as by means of bolts 32. A pump housing cover 33 is secured to the front face of the housing 3| as by means of bolts 34.

In order to facilitate manufacture and assembly of the housing 3| it is preferably made of three parts comprising the plates 3Ia and 3Ib and a gear receiving member 3Ic. Fluid is supplied to the pump through the inlet port 31 and forced outwardly under pressure through the exhaust port 38. Of course the direction of movement of the fluid through the pump depends upon the direction of rotation of the shaft I2, the pump operating in the usual manner of such gear pumps.

A short gear drive shaft 4I is mounted for rotation within-the gear housing I3 and gear case cover I6 by means of bearings such as the ball bearings 42 and 43 which rotate on races I9 and 22 respectively. Seals 44 are provided on each of the bearings I9 and 22 in accordance with the usual practice. 'Ihe shaft -:I is splined at the ends thereof, as indicated at 46 and 41, and the shaft is driven by means of a sleeve 48 which engages on spline 46 on shaft 4I and on splines 49 of shaft I2. A collar 5I is threaded on the opposite end of the shaft from the sleeve 48, and this collar is provided with a pair of conventional lugs 52 adapted to receive the end of a starting crank (not shown). locked in place by means of a bolt 53 which is threaded into the end of the shaft 4 I.

Av clutch collar 56 is slidingly engaged upon the splined portion 54a of intermediate spacer 54 which in turn is locked in place on splines 41 of the shaft 4| by means of collar 5I. The clutch collar 56 is provided with a peripheral groove 56a adapted to receive a yoke 51 for a purpose hereinafter more particularly described. The clutch collar 56 is also provided with lugs 58 which are adapted to engage corresponding lugs 59 on a large gear 6I which is rotatably mounted on shaft 4|. The collar 56 is thus adapted to be engaged and disengaged with the gear 6| by moving the clutch collar 56 along the splines 54a of spacer 54.

Movement of the clutch collar 56 into and out of engagement with the gear 6| is accomplished by means of the yoke 51 and a crank 62 which is mounted on a shaft 63 extending through the side wall of the housing I3. The yoke 51 is pivotally engaged to the crank 62 by means of a pin `64 which constitutes a part of the yoke and which extends into the crank. The shaft 63 is rotated by means of a lever 66 which is attached on the outer or projecting end of the shaft and extends upwardly therefrom alongside the pump. A plunger 61 is provided in the housing I3 above the crank 62 and a spring 68 biases the plunger downward against lthe upper face of the crank 62. The upper face of the crank is rounded in such a manner that the yoke is held in one or the other of its extreme positions so that the clutch is either in complete engagement with the gear 6| or is entirely out of engagement.

A pump drive shaft 1| is rotatably mounted-in the lower portion of the pump housingwbyy means of roller thrust bearings 12 whichl are Qmounted within the plates 3|a and` 3Ib. The s'haftlflll. is splined, as indicated at 13, andthe' puinpfdrive gear 14 may move along the shaft vto""an extent The collar 5l is which is limited by the plates 3Ia and 3Ib. As may readily be understood considerable hydraulic pressure is developed inside the housing 3| and in the chamber 16, andthisspressure acts upon the end of the shaft 1I to tend to force it out o f the pump housing. I have therefore made the gear 14 slidable on the shaft to preventundue Wear between the side of the pump gear and the plate Sla.

The pump drive shaft 1| is driven by means of a pump drive gear 18 which is located on the projecting end of the shaft 1I and which is in mesh with the large gear 6I. Endwise movement of the pump drive shaft 1I is limited by the thrust roller bearings 12. A shoulder 89 is provided on the shaft 1| and a collar 9| has the smallest end thereof bearing against the shoulder 89. The pump drive gear 18 in turn bears against this collar and is held in this position by means of the nut 92 which is threaded on the end of the shaft 1I.

A relatively heavy pin or shaft 93 is mounted within suitable openings in the plates 3 Ia and 3 Ib and this shaft serves as a journal upon which an idler gear 94 is rotatably mounted as by means of the roller bearings 96. The idler gear 94 is, of course, in mesh with the gear 14 and the two gears are utilized in accordance with the usualprinciples of operation of gear pumps to pump uid under pressure.

The fluid usually used with pumps of this type is lubricating oil and this lubricating oil, of course, lubricates the rotating parts of the pump proper. This lubricating oil is quite suitable for lubricating the rotating parts of the drive gear, but it is apparent that if any direct connection were made between the pump housing and the drive gear housing oil under considerable pressure would ow into the drive gear housing and would leak from the housing at both ends of the drive shaft and that an excessive quantity of foreign matter would be carried into the drive gearing. I have accordingly devised seal means for sealing the pump housing 3| where the shaft 1| passes therethrough, which sealing means will permit a limited or controlled flow or seepage of oil from the pump housing into the gear case housing.

In constructing my preferred seal means a cupped recess 91 is provided in the outer wall of the pump plate |6a. A gasket 98 is placed in this recess and a flexible cupped diaphragm 99 is placed on this sealing gasket.

A disc-like retaining plate IUI is placed on the diaphragm 99 and the diaphragm seal with its component parts is locked in place in the recess by means of a plurality of bolts |02. The diaphragm 99 is provided with a circular opening at the central portion thereof to receive the shaft 1I and collar 9 I. A stationary ring I 03 is secured to the inner edge of the diaphragm and bears against the rotating collar 9| to form a lap seal with it. The 'shoulder |00 of the ring, which is preferably of hardened steel or like material, is swaged solidly to the inner edge of the diaphragm, as indicated at |04. The diaphragm 99, before it is assembled on the shaft k1| and the collar 9|, has the central portion thereof flexed to the right, as indicated by the dotted lines of Figure 3, but when in position on the pump it is so disposed as to have its convex face bent inwardly .towards the direction from which oil escaping from the pump will flow. This engaged position is indicated by the full lines of Figure 3. The oil that flows from the pump housing tends to fill the cavity |06 and the oil pressure within the pump builds up pressure against the diaphragm 99. The'greater the oil fiow from the pump, the greater the pressure within the cavity |96 and therefore the greater the pressure against the diaphragm 99. As the pressure against the diaphragm 99 is increased and by reason of its exed arrangement it is caused to press against the ring |03 in direct ratio to the pressure within the cavity |95. Furthermore the endwise shifting of the shaft 'll by reason of the changes in oil pressure within the pump also causes variations in pressure of ring |03 against collar 9|. It is apparent therefore that the greater the pressure within the pump and 'Within the cavity |96 the greater the pressure of the diaphragm and ring |03 against the collar 9|, and consequently the greater the sealing effect. While the sealing effect becomes greater at high speeds, nevertheless the pressure of the fluid is higher and some slight leakage occurs to always provide sufficient oil to lubricate the gears. At slow speeds the biasing action of the diaphragm is sufficient to seal the shaft but will permit some leakage. It is apparent, therefore, that in this manner a controlled flow of oil from the pump housing into the gear case housing results at all speeds.

Although I have described a preferred embodiment of my invention it is apparent that modifications may be made by those skilled in the art. Such modifications may be made Without departing from the spirit and scope of my invention as set forth in the appended claims.

I claim as my invention:

1. In combination with a tractor including a radiator and a motor for driving the tractor, a gear housing mounted on the front of the radiator, a drive shaft mounted for rotation within the gear housing, coupling means for connecting the drive shaft with the drive shaft of the motor,

coupling means on the outer end of the drive shaft to permit attachment of a cranking handle,

a gear rotatably mounted on the drive shaft, a clutch on the drive shaft for engaging the gear,

a pump housing mounted on the gear housing, a 5 pump drive shaft, and a gear on the pump drive shaft adapted to mesh with the gear on the drive shaft.

2. In combination with a tractor, a pump and a gear housing mounted at the front of the tractor, with the gear housing attached to the radiator of the tractor, and clutch means arranged within the gear housing to provide selectively manually engaging and disengaging power means or cranking means or both for operating the pump.

3. In combination with a tractor including a radiator and a motor for driving the tractor, a gear housing mounted on the front of the radiator, a drive shaft mounted for rotation within the gear housing, coupling means for connecting 20 the drive shaft with the drive shaft of the motor, coupling means on the outer end of the drive shaft to permit attachment of a cranking handle, a gear rotatably mounted on the drive shaft, a clutch on the drive shaft for engaging the gear, a. yoke and crank means for operating the clutch, and a biasing means for keeping the clutch in the engaged or disengaged position.

4. In combination with a tractor including power means, a pump and a gear housing mounted at the front of the tractor, with the gear housing attached to the radiator of the tractor, a pump means, a cranking means for cranking the power means, and clutch means arranged within the gear housing to provide means for manually engaging or disengaging the power means with the cranking means and pump means.

ELLSWORTH W. AUSTIN. 

